Etymology
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password (n.)

"secret word appointed as a sign to distinguish friend from foe," 1798, from pass (v.) + word (n.).

updated on February 19, 2020

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Definitions of password from WordNet

password (n.)
a secret word or phrase known only to a restricted group;
he forgot the password
Synonyms: watchword / word / parole / countersign
From wordnet.princeton.edu, not affiliated with etymonline.